Fabrication of Si Nanoparticles Encapsulated into Porous N-Doped Carbon for Superior Lithium Storage Performances.
J Nanosci Nanotechnol
; 20(2): 949-956, 2020 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-31383091
ABSTRACT
To improve lithium storage performances of Si anode for lithium-ion batteries, Si nanoparticles encapsulated into porous N-doped carbon (Si@PNC) was devised and prepared by metal nitrate accelerated polymer blowing process. The Si@PNC composites have large specific surface area of 221.7 m² g-1 and possess a great deal of mesopores and micropores, which are attributed to the carbonization of PVP and etching metallic nanoparticles. As anode for lithium ion battery, the initial discharge capacity of Si@PNC composites is high to 1626 mA h g-1, and the specific capacity still retains 1030 mA h g-1 after 200 cycles at 200 mA g-1. Meanwhile, remarkably improved rate capability is achieved with an excellent reversible specific capacity of 375 mA h g-1 at 5.0 A g-1. The excellent lithium storage performances benefit from the unique porous core-shell structure of Si@PNC composites, which improve electroconductivity, reduce volume dilatation and accelerate lithium ion transmission.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article